US9802527B2 - Vehicle headlight - Google Patents

Vehicle headlight Download PDF

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Publication number
US9802527B2
US9802527B2 US14/889,668 US201414889668A US9802527B2 US 9802527 B2 US9802527 B2 US 9802527B2 US 201414889668 A US201414889668 A US 201414889668A US 9802527 B2 US9802527 B2 US 9802527B2
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United States
Prior art keywords
image sensor
processor
light
vehicle
housing
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US14/889,668
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US20160082877A1 (en
Inventor
Roland Oberhammer
Robert Hranitzky
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BLUETECHNIX GROUP GmbH
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BLUETECHNIX GROUP GmbH
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Assigned to BLUETECHNIX GROUP GMBH reassignment BLUETECHNIX GROUP GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HRANITZKY, Robert, OBERHAMMER, Roland
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/0017—Devices integrating an element dedicated to another function
    • B60Q1/0023—Devices integrating an element dedicated to another function the element being a sensor, e.g. distance sensor, camera
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
    • G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/93—Lidar systems specially adapted for specific applications for anti-collision purposes
    • G01S17/931—Lidar systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • G01S17/936—
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone
    • G01S7/4815—Constructional features, e.g. arrangements of optical elements of transmitters alone using multiple transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/51—Housings
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
    • H04N5/2252—
    • H04N5/2253—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
    • G01S17/894—3D imaging with simultaneous measurement of time-of-flight at a 2D array of receiver pixels, e.g. time-of-flight cameras or flash lidar
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
    • G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • G01S2013/9327—Sensor installation details
    • G01S2013/93277—Sensor installation details in the lights
    • G01S2013/9396—

Definitions

  • the invention relates to a vehicle headlight, comprising a housing and modulatable light or IR radiation sources arranged within the housing, and comprising an interface for connection to an external vehicle processor, according to the preamble of claim 1 .
  • All light or IR radiation sources radiating into the external region of a vehicle shall be understood as vehicle headlamps here and below, i.e. both front headlamps and rear lights which are used for illumination or signalling.
  • Vehicle headlights are increasingly used for this purpose in which LEDs (light-emitting diodes) are arranged on module supports in the manner of a matrix as light or IR radiation sources. If the LEDs used in this case are additionally operated with AFL (adaptive forward lighting) technology, the illumination profile of the vehicle headlight can be varied, wherein the LED modules can be dimmed to a differently strong extent by means of a vehicle processor depending on the desired illumination profile. Changes in the illumination profile of the vehicle headlight during travel, i.e.
  • the desired illumination profile can be selected by means of respective sensors for example which determine information from the ambient environment of the vehicle and respectively control the vehicle headlights via the vehicle processor.
  • the LED module for the front headlamp for example mixes white light by a combination of several wavelengths. These wavelengths are generated partly indirectly by blue LEDs made of gallium nitride (GaN) and a converter layer, and partly directly by yellow LEDs made of aluminium indium gallium phosphide (AlInGaP).
  • the LED modules for the rear lights or brake lights generate wavelengths around 700 nm by red LEDs made of semiconductors such as aluminium gallium arsenide (AlGaAs), gallium arsenide phosphide (GaAsP), aluminium gallium indium phosphide (AlGaInP) or gallium phosphide (GaP).
  • the beam formation of the LED modules is usually supported by plastic lenses and mirror reflectors.
  • ToF time of flight
  • the ToF cameras concern cameras which not only record a 2D image but also measure depth information for each recorded pixel. Depth information is understood as information on the distances between the individual objects of a scene and the ToF camera.
  • ToF cameras are also known as active cameras since they are equipped with their own light source, which will also be referred to below as ToF light source.
  • the light emitted by this light source is reflected on objects of a scene to be recorded and thus reaches the detection region of the image sensor of the camera as backscatter radiation.
  • the depth information is determined from the reflected light via the runtime and phase difference measurements.
  • the light sources are usually LEDs which emit modulated light.
  • the light is usually emitted by means of a ToF modulator in the megahertz range in an OOK (On-Off Keying) modulated manner (e.g. with 20 MHz), and is thus emitted into the field of vision of the own image sensor.
  • OOK On-Off Keying
  • the reflected light components are received by the camera sensor and used for calculating the distance of the reflected object. These depth data are subsequently available for applications in addition to the greyscale image.
  • Infrared LEDs or laser diodes are used for illumination in most applications.
  • PMD image sensors with 352 ⁇ 288 pixels (QVGA resolution) are currently usually used as image sensors.
  • the image sensors must be supplied with the OOK signal according to the shutter principle, which signal is also used synchronously for triggering the ToF light source.
  • the image sensor subsequently supplies an analog differential signal, from which the depth information per pixel can be calculated by using several sequential image recordings in the ToF camera processor.
  • the power dissipation of conventional ToF cameras lies in the range of 10 W to 100 W and is relevantly determined by the power of the ToF light source and the triggering signal.
  • a vehicle headlight comprising a housing and modulatabie light or IR radiation sources which are arranged within the housing and on a movable module support, and comprising an interface for connection to an external vehicle processor, wherein an image sensor for determining depth information from the backscatter radiation of the light or IR radiation sources is arranged within the housing, and a processor connected to the image sensor, which processor is connected via a modulator to at least some of the modulatable light or IR radiation sources arranged within the housing. It is proposed in accordance with the invention that the processor is connected via a bidirectional data link to the interface, and the image sensor is arranged on the module support or on an image sensor support triggered jointly with the module support.
  • the light or IR radiation sources of the vehicle headlight are thus used as light sources for determining depth information, in that the modulation capability of the light or IR radiation sources of known vehicle headlights on the basis of LEDs are used, even though the modulation is carried out conventionally at lower frequency.
  • Yellow LEDs with wavelengths of the yellow light component of approximately 600 nm are especially suitable for the front headlights and flashing lights, and red LEDs with wavelengths of the red light component of approximately 650 nm for the rear lights and brake lights. It has been recognised however that as a result of the increasingly dynamically arranged illumination profile of the vehicle headlights the backscatter radiation and especially the direction of the maximum backscatter radiation also change.
  • the vehicle driver responds to these changed illumination profiles by a respective movement of the head in order to look in the direction of the maximum backscatter radiation.
  • a ToF image sensor arranged in the region of the windscreen for example would also have to follow these changes in directions in order to receive sufficient illumination strengths by the backscatter light and to determine depth information from objects in the respectively illuminated region.
  • the arrangement of the image sensor is proposed in the housing of the vehicle headlight, and thus close to the light or IR radiation sources.
  • the image sensor is always in the region of the maximum backscatter radiation close to the optical axis even in the case of changed illumination profiles of the vehicle headlight, which optical axis is defined by the straight connection of the vehicle headlight with the respectively illuminated object.
  • the arrangement of the image sensor in the housing of the vehicle headlight further offers the advantage that it profits from the own cleaning systems for vehicle headlights which are currently increasingly available.
  • a separate processor is also provided in accordance with the invention, which processor assumes the function of a ToF camera processor, and is connected on the one hand to a modulator for the respective high-frequency modulation of the light or IR radiation sources of the vehicle headlight and on the other hand via a bidirectional data connection to the interface to the eternal vehicle electronics.
  • the transmission path of the high-frequency modulation signal can thus be kept short on the one hand without impairing the remaining vehicle electronics, and open-loop and closed-loop control tasks for illumination and signaling can be assumed on the other hand by the external vehicle processor and can be adjusted to the requirements of the ToF depth information determination.
  • the processor which is used as the ToF camera processor can thus exchange calculated data via the interface with the external vehicle processor, accept control information for changing the illumination profile from the external vehicle processed in real time, and change the illumination profile of the vehicle headlight by considering the requirements of the ToF image sensor in real time.
  • the image sensor is arranged on the module support or an image sensor support which is jointly controlled with the module support.
  • the image sensor also performs pivoting movements of the module support and is thus always positioned perpendicularly to the optical axis.
  • the time-of-flight camera processor is preferably connected to the module support and the image sensor support so that the ToF camera processor can also control their movements independently from the external vehicle processor.
  • FIG. 1 shows a schematic illustration of a vehicle headlight in accordance with the invention.
  • FIG. 1 shows a vehicle headlight in accordance with the invention, comprising a housing 1 with an interface 2 for connection to an external vehicle processor 3 .
  • Modulatable light and IR radiation sources 4 are arranged in the manner of a matrix within the housing 1 , e.g. on a movable module support 5 .
  • the light and IR radiation sources 4 are also provided with respective focusing optics.
  • An image sensor 6 for determining depth information from the backscatter radiation of the light and IR radiation sources 4 is further provided within the housing 1 , as is also used in conventional time-of-flight cameras, wherein the image sensor 6 is arranged in the illustrated embodiment on the module support 5 , so that during movements of the module support 5 both the light and IR radiation sources 4 and also the image sensor 6 are moved.
  • the image sensor 6 is usually also provided with separate focusing optics.
  • the relative arrangement of the image sensor 6 and the light and IR radiation sources 4 will vary depending on the configuration of the vehicle headlight.
  • the vehicle headlight is further sealed on the emission side with an optional protective cover 7 , which is transparent in both directions of passage for the passing light.
  • the arrangement of the image sensor 6 within the housing 1 in accordance with the invention also offers the advantage that the transmission behaviour of the protective cover 7 in relation to light of different frequencies is not only known to the manufacturer of the headlight, but can also be respectively optimised, especially concerning the image sensor 6 . Notice must be taken that windscreens are increasingly equipped with optical properties, e.g.
  • the protective cover 7 can advantageously be formed in such a way that it reduces scattered light from the light and IR radiation sources 4 to the image sensor 6 in order to minimise dazzling of the image sensor 6 .
  • the image sensor 6 is further connected to a processor 8 which fulfils the function of a time-of-flight camera processor and is connected via a modulator 9 to at least some of the modulatable light and IR radiation sources 4 arranged within the housing 1 . Since comparatively high modulation frequencies in the MHz range are required for gaining depth information via the image sensor 6 , it is advantageous to use merely some of the modulatable light and IR radiation sources 4 as ToF light sources in order to reduce the generation of heat on the one hand and to enable different brightness settings for example on the other hand with the remaining part of the modulatable light and IR radiation sources 4 by modulation in the conventional kHz range.
  • the modulator 9 is formed in FIG. 1 as a unit which can carry out modulations in different frequency ranges and is thus suitable for triggering all light and IR radiation sources 4 , irrespective of whether they are used for illumination and signalling or for gaining depth information.
  • the processor 8 is also connected in the illustrated embodiment with the module support 5 in order to trigger the module support 5 .
  • the image sensor 6 could also be arranged on a separate image sensor support, which in this case would also be connected to the processor 8 in order to synchronously trigger the module support 5 and the image sensor support.
  • the processor 8 is further connected via a bidirectional data connection 10 to the interface 2 in order to exchange data and control commands with the external vehicle processor 3 .
  • the processor 8 , the image sensor 6 , the modulator 9 and the part of the inodulatable light and IR radiation sources 4 which is modulated for gaining depth information with comparatively high modulation frequencies in the MHz range form a ToF camera, even though the functional separation for triggering the modulatable light and IR radiation sources 4 for illumination and signaling can hardly be carried out anymore.
  • the vehicle headlight in accordance with the invention can thus not be distinguished from a conventional vehicle headlight concerning its basic functionality of illumination and signaling, but offers the additional function of 3D depth calculation in each pixel of the ToF image sensor 6 and applications that can be derived therefrom.
  • the vehicle headlight in accordance with the invention additionally provides the programmable power of the processor 8 which can assume tasks for controlling the illumination or signaling, and for event monitoring in the ambient environment of the vehicle by the external vehicle processor 3 .
  • the vehicle headlight in accordance with the invention can thus assume tasks such as the calculation of the distance of objects in the field of vision of the vehicle headlight, the tracking of objects and persons in the field of vision of the vehicle headlight by calculating their motion paths, the calculation of collision probabilities with objects and persons by extrapolation of their movement vectors, the calculation of illumination profiles such as adaptive cornering light, static bending light or fog light for supporting driving operations, the calculation of illumination profiles for marking endangered objects and persons by additional illumination thereof, or the calculation of illumination profiles for avoiding the dazzling of oncoming traffic by selective dimming when travelling with high beam.
  • the vehicle headlight in accordance with the invention is within the responsibility of the producer of the headlight from a logistical standpoint. It is merely necessary to additionally control the interface 2 of the vehicle headlight to the external vehicle processor 3 , wherein a bidirectional control and event interface, which is preferably capable of real-time processing, to the vehicle processor 3 is adequate.
  • a bidirectional control and event interface which is preferably capable of real-time processing, to the vehicle processor 3 is adequate.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Electromagnetism (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Engineering & Computer Science (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
US14/889,668 2013-05-06 2014-05-06 Vehicle headlight Active 2034-10-28 US9802527B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ATA376/2013 2013-05-06
ATA376/2013A AT514218B1 (de) 2013-05-06 2013-05-06 Fahrzeugscheinwerfer
PCT/EP2014/059250 WO2014180856A1 (de) 2013-05-06 2014-05-06 Fahrzeugscheinwerfer

Publications (2)

Publication Number Publication Date
US20160082877A1 US20160082877A1 (en) 2016-03-24
US9802527B2 true US9802527B2 (en) 2017-10-31

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US14/889,668 Active 2034-10-28 US9802527B2 (en) 2013-05-06 2014-05-06 Vehicle headlight

Country Status (7)

Country Link
US (1) US9802527B2 (ja)
EP (1) EP2994347B1 (ja)
JP (1) JP2016522545A (ja)
CN (1) CN105492252A (ja)
AT (1) AT514218B1 (ja)
ES (1) ES2909663T3 (ja)
WO (1) WO2014180856A1 (ja)

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JP2016522545A (ja) 2016-07-28
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CN105492252A (zh) 2016-04-13
ES2909663T3 (es) 2022-05-09
AT514218B1 (de) 2015-05-15
US20160082877A1 (en) 2016-03-24
EP2994347A1 (de) 2016-03-16
AT514218A1 (de) 2014-11-15

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